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(Kamafugitic/Leucititic) and –Free (Lamproitic) Ultrapotassic Rocks and Associated Shoshonites from Italy: Constraints on Petrogenesis and Geodynamics

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(Kamafugitic/Leucititic) and –Free (Lamproitic) Ultrapotassic Rocks and Associated Shoshonites from Italy: Constraints on Petrogenesis and Geodynamics Leucite-bearing (kamafugitic/leucititic) and –free (lamproitic) ultrapotassic rocks and associated shoshonites from Italy: constraints on petrogenesis and geodynamics Sandro Conticelli, Marinella A. Laurenzi, Guido Giordano, Massimo Mattei, Riccardo Avanzinelli, Leone Melluso, Simone Tommasini, Elena Boari, et al Journal of the Virtual Explorer, Electronic Edition, ISSN 1441-8142, volume 36, paper 20 In: (Eds.) Marco Beltrando, Angelo Peccerillo, Massimo Mattei, Sandro Conticelli, and Carlo Doglioni, The Geology of Italy: tectonics and life along plate margins, 2010. Download from: http://virtualexplorer.com.au/article/2010/251/ultrapotassic-and-related-volcanic-rocks-in- italy Click http://virtualexplorer.com.au/subscribe/ to subscribe to the Journal of the Virtual Explorer. Email [email protected] to contact a member of the Virtual Explorer team. Copyright is shared by The Virtual Explorer Pty Ltd with authors of individual contributions. Individual authors may use a single figure and/or a table and/or a brief paragraph or two of text in a subsequent work, provided this work is of a scientific nature, and intended for use in a learned journal, book or other peer reviewed publication. Copies of this article may be made in unlimited numbers for use in a classroom, to further education and science. The Virtual Explorer Pty Ltd is a scientific publisher and intends that appropriate professional standards be met in any of its publications. Journal of the Virtual Explorer, 2010 Volume 36 Paper 20 http://virtualexplorer.com.au/ Leucite-bearing (kamafugitic/leucititic) and –free (lamproitic) ultrapotassic rocks and associated shoshonites from Italy: constraints on petrogenesis and geodynamics Sandro Conticelli 1. Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via Giorgio La Pira, 4, I-50121, Firenze, Italy. Email: [email protected] 2. Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via Giorgio La Pira, 4, I-50121, Firenze, Italy. Marinella A. Laurenzi Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via Moruzzi, 1, I-56124, Pisa, Italy Guido Giordano Dipartimento di Scienze Geologiche, Università degli Studi di Roma III, Largo San Leonardo Murialdo, 1, I-00146, Roma, Italy. Massimo Mattei Dipartimento di Scienze Geologiche, Università degli Studi di Roma III, Largo San Leonardo Murialdo, 1, I-00146, Roma, Italy. Riccardo Avanzinelli Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via Giorgio La Pira, 4, I-50121, Firenze, Italy. Leone Melluso Dipartimento di Scienze della Terra, Università degli Studi di Napoli Federico II, Via Mezzocannone, 8, I-80138, Napoli, Italy Simone Tommasini Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via Giorgio La Pira, 4, I-50121, Firenze, Italy Elena Boari Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via Giorgio La Pira, 4, I-50121, Firenze, Italy Francesca Cifelli Dipartimento di Scienze Geologiche, Università degli Studi di Roma III, Largo San Leonardo Murialdo, 1, I-00146, Roma, Italy. Giulia Perini Scuola Secondaria di I° Grado Enrico Fermi, Via Enrico Fermi, 4, I-52020, Laterina (AR), Italy. Abstract: In Italy and surroundings, leucite-free (i.e., lamproites), leucite-bearing (i.e., kamafugites, leucitites, plagioclase-leucitites), and haüyne-bearing (i.e., haüynites, haüyne-leucitites) ultrapotassic igneous rocks have been recorded from Oligocene to present in association with shoshonitic, and high-K calc-alkaline volcanic rocks. The oldest outcrops of ultrapotassic and related rocks are found within the western Alps in the form of lamprophyric to calc-alkaline dykes intruded during the Oligocene. Four different magmatic provinces, characterised by the association of ultrapotassic igneous rocks with shoshonitic to calc-alkaline series, are also found along the Tyrrhenian margin of the peninsula. These rocks have been produced from Miocene to Holocene with an eastward/southeastward migration with time. Leucite-free silica-rich ultrapotassic lamproitic rocks are restricted to the early stages of magmatism, whereas ultrapotassic leucite-bearing rocks to the middle and late stages. Mafic ultrapotassic igneous rocks are enriched in incompatible trace elements, with variable fractionation of Ta, Nb, and Ti with respect to Th and Large Ion Lithophile elements, and variable enrichment in radiogenic Sr and Pb and unradiogenic Nd. These characteristics are reconducted to sediment recycling within the upper mantle via subduction. Recycling of carbonate-rich pelites plays an important role in the genesis of leucite-bearing magmas. Journal of the Virtual Explorer, 2010 Volume 36 Paper 20 http://virtualexplorer.com.au/ Large volume of metasomatic components is predicted to be accommodated within a vein network in the sub- continental lithospheric mantle. Partial melting of the vein generates ultrapotassic magmas, either lamproitic or kamafugitic. Increased interaction between the metasomatic veins and the surrounding mantle dilutes the alkaline component producing shoshonites and high-K calc-alkaline suites. The addition of a further subduction-related component shortly before magma generation is required to explain the isotopic composition of rocks from the Neapolitan district, together with the probable arrival of a within-plate component from the Adria mantle through slab- tear. Citation: 2010. Leucite-bearing (kamafugitic/leucititic) and –free (lamproitic) ultrapotassic rocks and associated shoshonites from Italy: constraints on petrogenesis and geodynamics. In: (Eds.) Marco Beltrando, Angelo Peccerillo, Massimo Mattei, Sandro Conticelli, and Carlo Doglioni, Journal of the Virtual Explorer, volume 36, paper 20, doi: 10.3809/jvirtex.2010.00251 Journal of the Virtual Explorer, 2010 Volume 36 Paper 20 http://virtualexplorer.com.au/ Dedication Figure 1. Distribution of ultrapotassic and related volcanic and sub-volcanic rocks in Italy and surroundings The present paper is dedicated to the memories of Fabrizio Innocenti and Renato Funiciello who passed away on January 27th, 2009 and August 14th, 2009, re- spectively. Brief historical outline and lithologic terminology The potassic magmatism in the Central Mediterranean area developed through time from Oligocene to present, the last eruption of leucite-bearing magmas occurring in 1944 A.D. at Vesuvius. A pioneering comprehensive study performed by Washington (1906) grouped the sev- eral magmatic potassic and ultrapotassic suites in three different magmatic regions on the basis of sole minera- logical and petrographic characteristics: the Tuscan, Ro- man and Apulian regions. These regions were established without any temporal constraints. Washington (1906) did not describe and group the potassic volcanic rocks from Western Alps, Corsica, Tuscan Archipelago, and intra- Apennine area (Umbria). Washington (1906) also used a local lithologic terminology with rocks terms ranging The picture has been modified after Conticelli et al., from Vulsinite, Ciminite, Vicoite, Italite, Sommaite, etc.; 2007, 2009b; Avanzinelli et al., 2008, 2009. rock names not used anymore in the international termi- Avanzinelli et al. (2009) grouped the potassic and as- nology (Le Maitre et al., 2002). sociated volcanic rocks of the Central Mediterranean No further comprehensive studies have been per- area, by integrating the original division of Washington formed until the early sixties when Marinelli (1961, (1906) with the geochronological and genetic relation- 1967) reviewed the rocks of Tuscan Magmatic Region, ships, following the criteria suggested by Turner & Ver- including both mantle derived igneous rocks and crustal hoogen (1960). A division in four Magmatic Provinces anatectic ones, volcanic and intrusive, cropping out in the has been proposed. The Western Tyrrhenian (Corsican) same area from Pliocene to Pleistocene. This study has Magmatic Province is the westernmost one, with few somewhat complicated the general petrogenetic grid for magmatic products belonging to volcanic suites ranging potassic magmas. Some of the mafic Mg-rich rocks from from leucite-free ultrapotassic to high-K calc-alkaline of Tuscan region have been subsequently interpreted as the Miocene-Pliocene age (Fig. 1). During Pliocene – Pleis- result of complicate processes of enrichment in MgO, Ni, tocene, the volcanism migrated eastward to form the Tus- Cr and other compatible elements by gaseous transfert, can Magmatic Province (Fig. 1) with emplacement of starting from a granitic parental magma, of ultimate con- volcanic rocks belonging to leucite-free ultrapotassic to tinental crustal origin (Mazzuoli & Pratesi, 1963; Barberi shoshonitic and calc-alkaline magmatic suites (e.g., Pec- & Innocenti, 1967; Innocenti, 1967; Barberi et al., 1971). cerillo et al., 1988; Conticelli & Peccerillo, 1990, 1992; This brought also to perpetuate the hypothesis that leu- Conticelli et al., 1992, 2001, 2004, 2007, 2009a, 2011a,b; cite-free, Mg-rich, ultrapotassic magmas might have been Conticelli, 1998; Peccerillo, 1999, 2005a; Perini et al., generated by either direct partial melting of the continen- 2000, 2003). Coeval intrusive to volcanic silicic rocks of tal crust or by interaction between leucitic magmas and crustal derivation by anatexis have been kept separated crustal derived granitic melts (e.g., Taylor & Turi, 1976; because they do not have a common origin, although in Turi & Taylor, 1976; Vollmer, 1976, 1977, 1989; Vollm- some cases hybridization
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